Hand brace and similar tool



constructive point of view.

Patented `une 9, 1925.

BROR JOHANNES :BVE-' t'fsr'lS'SON-3 F'KALLER-ED, SWEDEN.

HAND Baacniinn SIMILAR Toon.

i Application filed Il'une 6,r

To all tlv/,tom it may] concern.'

Be itA known that I, BROR JOHANNES BENGTSSON, a Citizen (or subject) of Sweden, residing at Hogbo, Kallered, Sweden, have invented certain new .and useful lmprovements in Hand Bracesv andl Similar Tools, of whichthe ollowingis a specification. n

Hand braces orsimilar tools 'suffer asA well known from the inconvenience, that when used with especially long and tiny drills, these are apt of being broken on account ot the ditliculty ot keeping tbe brace exactly firm, so the drill does not need otbeing exposed to lateral stresses. To avoidsuch' inconveniences it has been proposed in several devices as for .instance to provide at the spot, where the drill is working, a movable support, the curved Vend of which embraces the edge of the workpiece, and lies close to the workpiece on the rear side thereof and thereby acts as a substitute tor the table of a stationary drilling machine fastenedr to the wall or kthe floor. Such a device"however can be'used for drilling near the edges or the workpiece only and it is not 'satisfactory from the This invention comprises an improved device for such kinds of. tools and has for its objects to make thev supporting means quite independent of the place of the hole to be bored. Another object of the invention is to make the supporting device especially {itted for drilling` what is called bottom holes which shall be given a distinct predestinated depth. A 'further object of this invention is to make the hand brace suited to be used in connection with a rather long drill.

This invention principally is characterized by a toot of somewhat the Same nature as the pressing foot of a sewing machine adapted to be pressed against the side of the workpiece which faces the tool. The foot can also have the shape of a point, a ball or a rubber dressed foot depending on the quality of the workpiece or the inclination of the brace towards the workpiece during the boring operation. Said foot is by means o't' springs connected with the brace in such a way, that the toot during the boring operation against said spring action takes up the requisite pressure upon the drill, and by this means keeps the brace 192s.' sei-m1 no. 6143,81'4.

stationary'in right position and avoids bending stresses upon the drill.

On the 'accompanying drawing an embodiment of the invention is'shown whereby Fig.y lfshows inA a side elevation a brace equipped according to'tliis invention. Figures 2 and 3 show the lower portion of the tool with parts of the improved device in two dierent operative positions. Fig.k 1 shows the toot or support from below.- Figs.A 5 and 6 show each the down portions of the device with the supporting member ot'. somewhat modied embodiments. The improved device 'comprises a bar 1 slidable inthe length direction of the drill 12 in two guides 2 and 3 projecting :from the brace ll'. Round thev bar 1 there is provided a spiral spring 4i between the said guides 2 and 3 in such a way, thatthe one end of the spring lies against the down side of the upper guide 3 and the other end against an adjustable stud 5 provided round the bar on the upper side of the lower guide 2. The bar 1 furthermore is provided with an angle bent foot 7 the flattened memberlt of which to be placed against the workpiece 13 has a shape like a fork and is provided with a slot 14 or in any other way so designed as mentioned before, that the toot can be applied close to the drill 12 (see Fig. 4c). Between the Jfoot 7 and the lower' guide 2 there is provided an adjustable Stud 10 round the bar 1. The studs 5 and 10 are provided with set screws G and 9, so they can be temporarily fixed on proper places on the bar 1.

The improved device acts in the following way: The set screw 6 is loosened and the bar 1 iXed in such a way, that the toot member 8 comes in proper position in relation to the point of the drill 12 (see Fig. 1).

Now the stud 5, of the spiral spring 4 pressed against the guide 2 is locked to the bar 1 by means ot the set screw 6, whereupon the stud 10 is moved to such ra distance apart from the lower guide 2 which corresponds to the depth of the hole to be drilled and locked in such position Vto thebar 1 by the set screw 9. The foot member 8 now Vis set upon the workpiece 13 the drill started with the hand brace kept such as is usual with similar tools, and the boring is continued under the requisite pressure on the brace Vwhereby the hand tool descends as the drill 12 enters the workpiece, until the stud 10 at the displacement of the bar 1 arrives against the guide 2 and interrupt a further descending of the tool, and the bore 'has obtained its predes-` tinated depth. i

When the brace is to be used for-'drills of a rather great length the foot member 8 is fixed below the point of the drill 12 as mentioned before, and the stud 10 fixed on Va distance apart from the guide 2 whic'h corresponds with the-largest possible compression of the spring 4L whereupon the drill is set on the workpiece, and the boring performed asmentioned before. V"During the descending of the drill 12 into the workpiece, the brace slides on the bar 1, so that the stud 5 is removed from the, guide 2 under a compression of the spring 4 until the spring'has been fully compressed o-r until the lower stud has reached theguide 2 ig. 2) which both foccurrences Lprevent the drill to be driven to a largerdepthE The upper stud '5 can now be loosened by the set screw 6, and the spring li'be slackened to its initial stress (Fig. 3), without that the pressure whichthe spring just before has taken up and which the tool continuously is exposed for in order to keep the drill stationary in the bore will be transported upon the drill during the mentioned shifting of the springs stress but will be carried by the stud 10, the bar 1, and theifoot 7 and member 8. flVhen the set screw 6 has been tightened once more the set screw 9 may on the surface facing the workpiece. This curved yshape ena-bles the brace 11 with the drill 12 to 'be tilted in relationtoV the work piece 123,y if the hele is to be drilled at a certain angle, to the surface of the work piece.

The last mentioned purpose also can be obtained, if the foot member instead of the flattenedy shape in? Figs, 1 4 is given the form of a pointl131 as shown in Fig. G, where the connections between the brace 11 and the' bar 1 vhave `been fully omitted in thedrawing, as they are of exactly the same nature as inthe preparatory described einbodiment.

The invention is susceptible of various changes vin its form, proportions and details of the construction,` and the right is herein reserved to such changes as properly fall within the scope of the following claims:

I claim: n

I1. A hand bra-ce including a. body portion adapted to support a drill, guides on said body portion, abar slidably mounted in said guides, resilient means for forcing said bar outwardly, adjustable studs on the bar for regulating 4the'yielding amplitude of the latter, and a 'footprovided at the outer end o f the bar and adaptedto bear against the face of the work piece actuated upon by the drill. p

2Q A hand brace including a body portion adapted ,to support a drill and provided with` guides, a 'supporting bar slidably mounted in said guides and provided at its outer end with a foot Vadapted to bear against the work-piece actuated upon by the drill, a spring between said guides and snrrounding the bar, a stop slidably mounted on the bar between said guides and engaging -one Aend of said spring, and a second stop adjustably mounted on the bar between-one of said guides and said foot.

In testimony whereof I have hereunto afiixed my signature.

BROR JOHANNES BENGHISSON. 

